User`s manual

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MELSEC-Q
8 I/O CONTROL INSTRUCTIONS
Specified position Symbol Name Recommended range
*1
Unit Data format
Standard
value
Store
D2
+18
+19
MH
Output upper
limit value
-10 to 110 %
Real
number
100.0 U
+20
+21
ML
Output lower
limit value
-10 to 110 %
Real
number
0.0 U
+48
+49
DML
Output
change rate
limit value
0 to 100 %
Real
number
100.0 U
+54
+55
I
Integral
constant
0 to 999999 s
Real
number
10.0 U
Loop tag
memory
*2
+62
+63
MVP
MV inside
operation
value
(-999999 to 999999) %
Real
number
0.0 S
*1: The data of the item(s) where the values within the recommended range are given in the parentheses are stored by the system.
Users cannot set the data.
*2: The loop tag memory and loop tag past value memory occupy a total of 128 words. (Refer to Section 3.3.1 for details.)
(2) Execution cycle ( T)
Set the execution cycle in SD1500 and SD1501 as real numbers.
Processing contents
(1) Mode judgment
Either of the following processings is performed depending on the operation mode (MODE).
(a) When the operation mode (MODE) is any of MAN, CMB, CMV and LCM (alarm clear
processing)
1) MHA, MLA and DMLA of the alarm detection (ALM) are turned to 0.
2) BB1 to BB4 of BB are turned to 0.
3) The tracking flag (TRKF) of the alarm detection inhibition (INH) is turned to 1.
4) "(5) Output conversion processing" is performed and the instruction is terminated.
(b) When the operation mode (MODE) is any of AUT, CAB, CAS, CCB, CSV, LCA and LCC,
"(2) Input addition processing" is performed.
However, when SEA of the alarm detection (ALM) is 1 and SM1501 is ON (with hold), BB1
to BB4 are turned to 0 and the S.OUT1 instruction is terminated.
(2) Input addition processing
The temporary MV (T) is calculated on the basis of the input value (E1 MV).
(a) When the tracking flag (TRKF) of the alarm detection inhibition (INH) is 1, the following
processing is performed.
1) The manipulated value (MV) is stored into the MV internal operation value (MVP).
2) The input value (E1) is changed to 0. (
MV 0)
3) The tracking flag (TRKF) of the alarm detection inhibition (INH) is turned to 0.
4) The temporary MV (T) is calculated with the following expression.
T E1 MVP
MVP
T